Turning up in the middle of this project, I have no idea what it is. What are you sewing?

I learnt to sew on a machine like that, and it taught me as much patience as it is possible for me to learn. Hopefully adjusting the bobbin tension will help :-) If not I've a whole slew of other suggestions!

My current machine is a darling with a drop-in bobbin, and is a really good workhorse. SO much easier than the one I learnt to sew on!